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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763ac1f76ec8753c151c022ff4a4dcb680a8836671799623836b8ee2804acada' 
  AND token = 'Go5sb3i+ivMHwtyVQAEE0ZKafOt1bsqYyRikthmKYWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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