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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af4c1d3914879d876d09e12599129302c57efbbd6a379c28961a1fec392e540' 
  AND token = 'Pa+QZ0rV74NhHM01iKzCwcRUgCiw1pK1nbymzzw2rms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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