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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7f68c6d1c9d2e827497124a2d71cd1ea3f92b8126257bc07f9c81d02bb7ab4' 
  AND token = 'cwx/Xf27cpQgsgyAiQ+Q25B4pDmreYvG5eJTJjQNDgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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