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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b477071dafbc11f687a084179386655d49848c7d2e4b592ddef597c7acfc8fa8' 
  AND token = 'Gok+psTlsJWiYDe+4niTz8rl1Z/JpzA6jDf4y5Nwopk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}