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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fbc5090ee2f103a955309eb61627c53b979ab3e3aee5a8aa294eaf760d3da6' 
  AND token = '8OeG9kI8eEjIwpcHGpZlXRkd4SRNXz8wNhH+r/aTbIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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