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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b439850c6d3a4431b18eb9fc588e60b57055a8a409f5e12d7d4910273df3a30' 
  AND token = 'la4vutok8zTPLbWov+5n1Mk+NLXcmrk9XUvFEn7GDd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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