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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdc95c1b9bfd391c92dc94d2aac85399d746d1c9e1465f577ea7617df91e2e7' 
  AND token = 'b29SXL9c3kmOVFo3rwUaQsHPfmmfIEW+tFDB6EHtEdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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