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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f98d211d1ca700d17c0332b68fed7c966bb74da9dcf161f98f935b387e8fa8' 
  AND token = 'NgoC+soMqEeMJWqXxCI0QADAHeKnpn/H18W/CI1Gqok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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