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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26ed2d5d515f162a5c0b3c9e80163fa2df5d29ed74178851b72e96ffe7c693c' 
  AND token = 'xxAzprjmT4iXsCl91zkySjG0WTjGd5i3qz2/j9uT6TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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