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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc568f0def4d4161ca1c7516dc8be04d663aab09f0aa5dc5e41874738ce523f' 
  AND token = 'rbyjjzkf3LimH3FYN6OMtdaZ/ORwHACwwNHaKr5lIns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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