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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82075d37c7243753b94689db81b3689502ed9b7773c6fb75ba737e258dc1a992' 
  AND token = 'u7oXsjmrks2Jf9hC5aTGLAzqWoozuUDuo5TZijG1Fqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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