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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c4360807a6a2a65acfdffc1fe580ae2c037db96461f9c582a95b7a126492be' 
  AND token = 'Cik5JLfEiPPyrde9zT9HSBNuNSXYDGlIEEQlveo4ByA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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