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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce43ad9b02f27e964fc0bb010986a772868d606441a6f6cb561da3d5ec32bab9' 
  AND token = 'RKf+tuN3MdO7Z8frjDG0VtP5N5doSveS3o/D/rRPJZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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