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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f34d816ce00184791285863f28a7631cf7247e99a0825f53c94e9819f3f00cc' 
  AND token = 'ZRS/cpQeDqwQbe3P6YWUyrkeX22Vv5e2anw7pWkUHXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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