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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4877750786d84f42314cc786f12fee18d617aa4cc8dd964e3e4dde55809168a1' 
  AND token = 'TqGKEMeAgh0/z2zOvAzAszCSdycIpbIyq+H3XqBXZIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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