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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec35cb74dab1db04b769ce6200a96471eb0cda0f94aac2d196076dfee198f75a' 
  AND token = 'HU99JZcfQet50u48ww/RMPbVaZErQisPu8/K0fj+IXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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