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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315d68e496f2170c31ab875b0d153103baaabbb483fef3a89fa59e2257187663' 
  AND token = 'Jp7cxmPzTld+f34Z/kCvg/DcFMeW+WjCTs73US84hD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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