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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bed8b4d472f03689e9dfbe68dd9f69abd3a56c34c79db85f9846da1e3b210ca' 
  AND token = 'P/64tz51SjjV4tP+D/UJek89Bt9ALSEUvs/ZvQqNyps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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