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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab1573d183dfe5536539192d4b55bcbca5a0f846cef44e03958e53806b3fd15' 
  AND token = 'HF8LIqL4JlLu/SxUFVgJ5c4CsL5E8uoVHXOD/i6yu9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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