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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a293ae63557bed9580513e538fc385e991a336eb00f4922b4cdb794fcaf2db2f' 
  AND token = 'wPDV5VBi40MHOTtlXOiJTiXk1i3X+4jnI4UU4vCs24E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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