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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea763cb0aec8d0771c30ebe1f7cacf064d7d05d1c649eeedec2cf823b52d579b' 
  AND token = 'XpAxbJ5TrC3X5me6ev7K6PVZYoW5/hkR8Nrxk7zDngE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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