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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84deaaef895af54ce440c6b62031370f16e43ad911190e5d574357f7d3f563c4' 
  AND token = 'Ol/3eMFt2SXd4H59PhjD7VGPw4aO5T8rySweYn48fFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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