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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085456cbd24d477b63bac9e976d029254269e9aac781877e32150298214f7316' 
  AND token = 'OkePrOa7dZ/SC5etoWnPdqP15I5zli/i4yqr83Qk6lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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