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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70b78db6089ae96e24800320b572abc4c42e040c455cf3b8b6a1d1a370854b8' 
  AND token = '1dPUfSo+stCghzn+iMXAcD72LcqAC+c3ePGoK7pmVJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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