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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f772a24a2feb71e94e33c211c39ad2ade6ab2f5675c33bb9735b702a19c11b' 
  AND token = '7kMrcJY9daidN4EXc4ytWgq8yW49kGuwKre+diqtsRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00266

JSON explain

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