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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f08fdaa89a0f1fbc34a44e1dc1e4155c97efadd45489dd05f150e5090244f6' 
  AND token = 'd7wdnXdhMfayt6Dpy1RDpMfqFJ9oxu6FasGYXsIpRrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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