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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e719b97513dcf50dc451363bb93af3d65cb7e7048399bb3697ea1b6ef58ba000' 
  AND token = 'F4JkTZw0i+5la2+lgRtYR3LMpZx+Y9qqnnlE5H5cieA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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