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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64fe534202626a554baf92fd8e11bab67bbc9acab3f47c9e66bd4062aaf689e' 
  AND token = 'cK/IXfTScLxSWB391m8T7Q8S0xNiSNnwL2QPgPtp070=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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