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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaf3ddc959e21bf32834ce534231fa2acebc0411d634a55d98b55c97432f020' 
  AND token = 'AWGFifUl5AnqSep3bWCUKunVk5Cd+loMLdQ5bT2oVgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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