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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09039ed2060a9b5551bee3f50e2c23ebcf92d6f17a46328cc161bba3dc3082d' 
  AND token = '/pp2v6pYHL0u0FizaXx9iWYpqUPZpmiMrk5Bbftq1q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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