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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c73bab239984ff3348b5effb3c0f921f3ad10c7e7557ed8b094998c926d8a45' 
  AND token = 'aav948I1SJ78/pH64xsD+80qT76vJ8+SvZOajppKAqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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