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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2d3a1c2958b3df764219173e44a6171c7a3a882b2b057748d12c5cc3130802' 
  AND token = '/VqBe3xxTpx5Uzp/WLGpqxhMDRH0ZZO0lZrhh51kE64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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