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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32ccba41fdcf92c582678fad7ce87487bb9a8c767960ce3599ef3b734a13c3c' 
  AND token = 'J6SY8+0e1EfTmcbZU5f1iVYrY366WR5k2jDyY+xupVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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