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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7046f74fb27493db0849f33ff1b1d716bb75ccdf6f5906f266bfa6910e9b1b5d' 
  AND token = 'kGdGPWjIONn+rkk6XwOch/Hw7UNeNTJ00BLcZrOuQ1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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