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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6a3573b373a0dcd97116f4de3ea8a8e174e810c39383eec773ce01d5620074' 
  AND token = 'p4Kcvm0JXi7+O+6QxpspT8IcRQqCY5elNofODAFQrbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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