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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7070e5d5b7eda3fb2c6debc08f562ffe583a0c98d734ae530d5fe0b559202b11' 
  AND token = 'L10Cu4YejAqpjFacW2JDhRhR3sevRiI7aC7EpMoim7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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