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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930b1e64e5b594d294d4313e8cb331da64d7cf0ba70037d8b81000b88c34b464' 
  AND token = 'TdQcVCuDnAugImmZwKsXA18jKkqdRHWLqGX3qVsFi2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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