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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa374da37fb2b701c383a553b34722e69413baad79a916e776239f98c364224c' 
  AND token = '+i+ZfZPHE67MbMaFS6rAXtCwP6MLoPKS8PHYYwO3vP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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