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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9b78f616db381f6c45c42f9854aa44d0b3607497619634d65968eee5bd471e' 
  AND token = 'vC69kPUTaewD/WbVeXPG3whdn1DcOl88GvfCIE6hbLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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