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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b191df06157587fb2ead12043d73a5b4f78767f1444420930d13e30fbe8c68' 
  AND token = 'MT7s+9IfQk366aHbOb/ih14F71RSt+hRDf71AxBAMpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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