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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd76818ba6fc7cca0dae11367dc85c2297dfb458b4421441a9d9b2426f8d2d43' 
  AND token = 'w/MdwI2OlObMAr1o55NGB6YlVlkmA3n2fGk7ZySep5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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