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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2ce27934d6b907a79ee8e80a2a2f8680fa740199477be1623b08603e8970fb' 
  AND token = 'DE19mEq+XucdHlQPqBQoxWhcxngM+v1opgvdJd1hQ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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