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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e10304e63988ad9e293db3e7ef96baa1dba9fb8eec7528f0f3a4e29ab60c78' 
  AND token = 'wv2aAgxogJIafIpBC0WRB7Hl8u4TF8WXJEjm6F5ziaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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