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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbdc2b444337b947551827c10a1a15cb0e7d82931431f9faf7b0e1c8ed87887' 
  AND token = 'zqL5XNbb2jg0yLxuA7GWQuHydV68GOgtEecTLJaAz6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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