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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8af853cc9e1a9ac92fe1cc1677d7f9217fdcaae5e9449c28a0e2bbbfb7f85e' 
  AND token = 'mrXFa/zlLYnTP/n750bhBtyibDcuf5sg78bOJAEdtSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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