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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abc21752433cd12fd83719211aa35d373b97a54ae1ed060cbe892bf7c6328c0' 
  AND token = 'n8HO206V8yDaGg3U5dLexP3gM8R6lAuEf/OAWjJoPl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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