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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc737e0500b4372b6962993b5574ead9d7eda985fd0dc567e4e9a50c708217b9' 
  AND token = 'FtgMbUJWw01zRb9nmN6s1EO0GGY7lW2dGPjatGlfs2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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