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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0a95e85a09cfeb545a99abf96b3d93d2a9f8833a6690be875e043ac98f7b9a' 
  AND token = 'gLCp2yF2WefZWyvAM421OJ3OzY2sStJ87tPjgOignk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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