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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d4554e38be108666670a6fce3e299d4412e2d7cc5ec16b75ad8ade1a8136f6' 
  AND token = 'Ev/TmVenukQ7YhmQGRx+aVkGYVIdwld+r9kbiDMvVOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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