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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f89c62f67d15e1fe568d6ab95dbccd859a52b283e033515e7c44cd2139986fa' 
  AND token = 'Zr/0If6KiSxQVAld9sKoFlXM3QU592xPXb2lolud8RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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