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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d73a113c7df7bbf4ddb17a3d2c8c73b3a193cba8d8845481400974c0cebe4c' 
  AND token = 'NWjl+F4yx6VdbJ/V0MgN+J8BVLOH4+x78aQv2ykhEUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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