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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9a203988a4a0d3be0762eec2d44efacdb3ffa7a6017cb56420ce455c015974' 
  AND token = '135o31vrJAqNg9ZYnN7dH01935OHHde/5H7DasrZato=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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