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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918f40026ae4c42256dd394b8488c77e6fb5305b597982fcbe4c71ed0007a607' 
  AND token = 'WSIIDHG61/jf0aXEiXCCX2g9RopP3Dmehd3aR8lrBIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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