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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47089ed041d460c6601a645e8b3c999b07a59660623db3b197fb332b5e527091' 
  AND token = 'ADY2Xc26lje5oSyZ1JMM/mPXcCIVjBbyR/HWODvdbhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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