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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f2b3fdc531920cefa2dd5663cfa2da0907e80e7e6f007f4d04f900ae10e912' 
  AND token = 'c2NMKd7d1CAF9ZpEM9mnbNTFwt1F59SZmzln+6+uV8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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