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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414a3ede24cff31a5721cbc5bf789e11120c349bf26bb1d1a78313c14b45e599' 
  AND token = 'nS2Q5rbUwMOPO2Gmh0YmCNmaT4yEj+Y11Mwt9Pgp3zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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