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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524483344e8ddd6cd82baca15eac47e254cf5f04978da3e6f56d91d683e341b6' 
  AND token = 'bpnn6yZp+OYiLW87u/fbSHNL723p8Oyoi26ovjptaqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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