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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f84215655bbf25e5782bd4112842d13b2b801cb33ad808dcb8826768772699a' 
  AND token = 'exk9oldgF3h89tVNfmJxnqUl+Zus+zStAzZ7aCc3Nno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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