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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ba6d3c2bf007c6887ed7c75f890bc0516a2fa38380ba3b833ca8fd0d168e3e' 
  AND token = 'Dce/hsX65zXJIgjhDgXfyt5kjgXUaQSjHtGX+YXRf+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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