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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffed8dbf6f3095f5bc276e168b7a0cfe6316f449471ee2dbac9e51d5e642a8c5' 
  AND token = 'LG6RbHj6ILKDOh8YJcEwLUI5SDf9SKHdjpPlZTAUeYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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