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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7c2918890a3ecb12eafe1a2632d4b939cb29246575d69603b75dcb0e28eb66' 
  AND token = 'xveAerH0hpFmiC8OdzeZfGSeRRCiCBvuVy8NKFxxxfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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